Enhancement of Heat Transfer in an Inclined Tube Using Vortex Generator

Waleed Yousif Shehab


College of Engineering, Department of Electromechanical Engineering, University of Technology Iraq

‡Department of Physics, College of Education, Mustansiriyah University, Baghdad, Iraq

Corresponding Author Email: 50195@uotechnology.edu.iq

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

The performance of heat exchanger can be ameliorated via several methods. This research presents a numerical and experimental investigation to study the heat transfer enhancement in an inclined tube having a twisted tape with v-cut. This study includes constructing a test section, which consists of a tube made of copper having (1 m) long, with internal and external diameter of (23, 25 mm) respectively. The coolant flows through the inner pipe under laminar flow (1056 ≥ Re ≥ 2002) regime and uniform heat flux (2420- 12261W/m2). The pressure drop, wall temperature, flow rate, temperature of distilled water through a tube with a circular cross-sectional area and twisted tape inserts were measured. Fluent, the CFD (Computational Fluid Dynamics) extension of the software Package of Ansys 15.0, was used to solve the governing three-dimensional equations with the finite volume technique and to evaluate the effect of Reynolds number, twisted tape types and twist ratios on the enhancement of heat transfer, loss of friction, average Nusselt number, velocity profile, the performance of thermal characteristic factor within a tube having a circular cross section and also with a laminar flow. The simulations were performed with different values of Reynolds numbers using water as working fluid. Experimental data were compared with the numerical results and this showed a high similarity, with a maximum error of 10% that was obtained while using the twisted tape having a v-cut with a twist ratio (TR) equal to 4.